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Appearance of Herbicide Resistance in a Weed Population

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Through the repeated use of the same herbicide, weed populations can consist of susceptible (S)-biotypes that are controlled and herbicide resistant (R)-biotypes that are left behind to produce and return seed with the resistance characteristic back into the soil. This lesson will highlight the population dynamics of a mixed weed population, containing S- and R-biotypes, and compare and contrast the rate at which herbicide resistant weeds appear in a population under a diversity of selection pressures. This lesson will highlight the population dynamics of a mixed (herbicide susceptible and resistant biotype) weed population, and compare and contrast the rate of appearance of herbicide resistance in a mixed population under a diversity of selection pressures.

Introduction

J. Anita Dille
Department of Agronomy at Kansas State University, USA

Deana Namuth
Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA

Journal of Natural Resources and Life Sciences Education Seal of approval
 

Lesson Navigation Tips:

  • Click on ’Lesson Media Objects’ button found to the left in order to view the animation which supplements this lesson. You can also click on the animation icon within the text.
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Overview:

Through the repeated imposition of the same herbicide, susceptible (S)- biotypes of a weed species are controlled and herbicide resistant (R)-biotypes of the same weed species are left behind to reproduce and return seed with the resistance characteristic back into the soil. This lesson will highlight the population dynamics of a mixed weed population (S- and R-biotypes) and compare and contrast the rate at which herbicide resistance appears in a weed population under a diversity of selection pressures.

Objectives:

 At the completion of this lesson, students will:

1. Understand the differences between susceptible, tolerant, and resistant weed populations.
2. Describe diagrammatically and mathematically, the dynamics of an annual weed species population composed of S- and R-biotypes.
3. Describe herbicide characteristics, aspects of weed species biology, and management practices that alter intensity of selection pressure and impact the rate at which herbicide resistance appears in a weed population.
4. Devise a weed management plan with a diversity of selection pressures to reduce the rate at which herbicide resistance appears.


Development of this lesson was supported in part by the Cooperative State Research, Education, & Extension Service, U.S. Dept of Agriculture under Agreement Number 00-34416-10368 administered by Cornell University and the
American Distance Education Consortium (ADEC).
Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

A contribution of Kansas State University and the University of Nebraska Cooperative Extension. Journal series No. 1025

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